There's no way any kind of booster should affect the temp gauge, as that circuit comes from the positive, through a thermal resistor on the thermostat housing, to the gauge and back to earth. How the hell the restrictor is doing that I don't know, but can only assume it's creating some kind of short circuit.
Sounds bad to me!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
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